Interlocking mechanism



s'sheets-sheet 1 ATTORNEY Feb. 23, 1932. E. L. DUNN INTERLOCKINGMECHANISM Filed Feb. 27, 1930 Y Wu "1171 FIQIO Feb. 23, 1932. E, DUNN1,847,039

. INTERLOCKING MECHANI SM Filed Feb. 27, 1930 5 Sheets-Sheet 2 Feb. 23,1932. E. DUNN INTERLOCKING' MECHANISM F'iled Feb. 27, 1930 5Sheets-Sheet 5 (2W LA U INVENTOR ATTORNEY v Patented Feb. 23, 1932Qumran srares PATENT OFFICE EDWARD LEE DUNN, 0F EEC-NTCLAIR, NEW JERSEY, ASSIGNOR T0 OTIS ELEVATOR COH- PANY, OF NEW YORK, N. Y., ACORPORATION OF NEW JERSEY rn'rERLocrane MECHANISM Appiication filedFebruary :27, 1930. Serial No. 431,743.

The invention relates to interlocking mechanisms for the hatchway doorsof elevator installations.

In the development of the elevator art it has been found desirable,particularly in clevator installations of the automatic push buttontype, to provide locking means for the hatchway doors in addition to theconventional manually operated latch mechanisms in order to lessen thepossibility of injury to,

persons due to their opening a hatchway door and falling in the hatchwayor being struck by the elevator car while it is in motion. It ispreferable that the hatchway doors, other than at the landing at whichthe car is positioned, be locked in closed position and that all thehatchway doors be locked in closed position while the car is in motion;It is also desirable to provide switches controlled by such lockingmechanisms and arranged in a control circuit for the elevator car, suchas the starting circuits therefor, to prevent the operation of theelevator car when'any hatchway door is not locked in closed position.

A feature of the present invention resides in the provision of means forlocking the latching means for a hatchway door in latching position.

A second feature resides in preventing the unlatohing of the hatchwaydoors at landings other than that at which the elevator car ispositioned.

A third feature resides in unlocking the latching means for the hatchwaydoor at the landing at which a stop is to be made upon arrival oftheelevator car thereat.

A fourth feature resides in interrupting the control circuits for theelevator car, to prevent its operation, when the door is unlatched. 1 I

A fifth feature resides in the provision of means moving with thehatchway door as it is opened for maintainingthe control circuitsinterrupted while the door is open.

A sixth feature is the provision of circuit controlling mechanism at oneside of a hatch- Wayv door which is controlled by door latching means atthe opposite side of the door.

A seventh feature resides in the provision of latching mechanism at theforward side of a hinged hatchway door in conjunction with the doorcasing to latch the door in closed position. A shaft rotatably mountedin the door casing carries a locking lever projecting through an openingformed in the hinged side of the door. The locking lever has anextension adapted to be seated in a recess in member carried by thedoor, at-thehinged side thereof. A bell crank lever mounted on the doorcasing is biased to position the end of one arm of the bell crank in'thepath of movement of alug on a collar fixed to the shaft which carriesthe locking lever. hen the end of the arm of the bell crank is thuspositioned, rotary movement of the shaft carrying the locking lever isprevented. Vhen rotary movement of the shaft is prevented the lockinglever is maintained positioned to lock the latch bolt against retractionto unlatch the door. The elevator car is provided with a retiring camWhich is projected,'upon arrival of the car at a floor at which a stopis to be made, to operate the bell crank. Upon operation of the bellcrank the end of its aforementioned arm is moved out of the pathof'movement of the lug on the collar to permit movement of the shaft andconsequently of the locking lever, thus unlocking the latch bolt. Thelatch bolt is operatively connected to the locking lever so that whenthe latch bolt of the door at the landing at which the car is positionedis retracted the extension of the locking lever is raised out of therecess in the member carried by the door and the shaft carrying thelocking lever is turned. The shaftcarrying the locking lever is arrangedto operate an interlocking switch to interrupt the control circuit ofthe elevator car to prevent operation of the car when the door isunlatched or in open position. When the door is opened the abovementioned member there on moves therewith about the centre line of thedoor hinges and supports the locking le ver in raised position. Thus thecompletion of the control circuit is prevented until the door isreturned to fully closed position and latched.

In the drawings:

Figure 1 is a schematic view of a portion of an elevator installationembodying the in terlocking mechanism of the tlon.

Figure 2 is a front elevation of a hatchpres nt invenway door.

Figure 3 is a sectional view, partly broken away, taken along the line33 of Fig-v ing of the control circuit.

V Figure 5 is a sectional View taken along he l1ne.66 of Figure 4showing the locking lever seated in the recess of the member carried bythe door.

Figure 7 a sectional view taken along the line 7-7 of Figure 6illustrating a detail of construction.

Figure 8 is a sectional View similar to Figure 3, but showing the doorunlatched and in open position and also showing the locking leversupported by the member carried by the door.

Figure 9 is a sectional View similar to Figure 6, but showing thelocking lever positioned to permit opening of the door.

Figure 10 is a sectional view taken along the line 1010 ofFigureillustrating the construction 01" the latch and its operating mechanism.

Referring to Figures 1 to 3, the numeral 21 designates the wall of anelevator hatchway which is provided with an opening at each landing forreceiving a door casing 22. A hatchwaydoor 23 for closing each openingis swingingly mounted in each casing on hinges 24. The numeral 25designates a combined door closing and checking device of any suit abletype for automatically moving the door to closed position and forcushioning the door a it approaches closed position.

it is customary with swinging type doors to provide a latching mechanismto maintain the door in closed position. In the embodi- -through doorcasing ment illustrated each of the doors is of metal and of hollowframe constructio--, and each door is formed with an opening in one edgefor mounting the casing 26 of a latching mechanism within the doorframe. Referring also to Figure 10, each latching mechanism comprises alatch bolt 27 guided in openings 28 and 30 in the end walls of casing 26and arranged to be projected from the casing by a spring 31. Spring 31is positioned between-a boss at one end of a slot 32 in latch bolt 27and a stop 33 mounted on the wall of the casing and positioned withinthe slot. The latch bolt is projected from the easing into an opening ina keeper 34 mounted on door casing 22 to latch the door inclosed-position, the movement of bolt 27 by spring 31 being limited bythe engagement of one end of slot with stop 33. A member 35 is pivotallymounted on one wall of casing 26 and carries a pin 36 engaging one endof a slot 37 in the latch bolt. A member 38, journalled in the walls ofcasing 26 in any suitable manner, has a portion 40 engaging the pin 36carried by member 35 and a tail piece 41 engaging a lu 42 on'member 35.A latch operating sha t 43 extends through casing 26 and through thesides of the hatchway door. Shaft'43 is operatively connected to member38-so that when knobs 44 secured to shaft 43 on either side of thehatchway door are grasped and turned counterclockwise the portion 40 ofmember 38 engages pin 36 rocking member 35 counterclockwise to retractbolt 27 against the force of spring 31 from the opening in keeper 34. Inthe event that either door knob is turned clockwise the tailpiece 41 ofmember 38 acts on lug 42 on member 35 to turn the lattercounterclockwise so that the pin 36 carried thereby effect-s retractionof latch bolt 27. The withdrawal of bolt 2? from keeper 34 is limited bythe engagement of shoulders 45 on the latch bolt with the end wall ofcasing 26 adjacent opening 28.

Interlocking mechanism is provided for each hatchway door for lockingthe latching mechanism against operation to unlatch the door when theelevator car is not at the landing at which the door is located and toprevent the operation of the car when any door is unlatched or open.Only the interlocking mechanism for one hatchway door will be describedin detail since the interlocking mechanisms for all the hatchway doorsare of the same construction. Referring also to Figures 4, 6 and 9, alocking lever 47 is fixed to a shaft 48 extending 22 at the hinged sideof'the door. Shaft 48 is journalled in a bearing 50 mounted on a support51 within the door casing. The edge of the door is cut away on thehinged side to form an opening 46 through which a locking lever 47adjacentopening 46 and has a substantially cylindrical portion54projecting from the front of the door through opening 46. Member 53 ismounted so that the vertical axis of portion 54 thereof coincideswiththe centre line of the hinges 24. A part of one side of cylindricalportion 54 is-cut away toif orm a recess 55 for receiving the extension52 of lever 47. The underside of extension 52 I. is soshaped that whenthelocking lever is raised the underside of the extension is parallelwith the top of the cylindrical portion 54, as is shown in Figure 9. Thebase of recess 55 1S correspondingly shaped to form a seat '56 forextension 52 so that when lever 47 is in its lower position the top edgeof extension 52 is preferably flush with the top of the cylindricalportion of member 53 and the underside of the extension rests in contact with seat 56, as shown in Figures 4 and 6.

One arm 57 of a bell crank 58 rests in engagement with the underside oflever 47. Bell crank 58 is journalled on a stud 69 mounted on aninterior wall of the door and the other arm 61 of the bell crank is pivotally connected to one end of a bar 62. Bar 62 extends across thebatchway door 23 and is connected at its other end tothe end of latchbolt 27 which projects through opening 28 in latch casing 26. The arm 57of bell crank 58 is adaptedto act on lever 47. when latch bolt 27 iswithdrawn to unlatcll the door, to raise extension 52 out of recess 55for unlocking the door.

Referring also to'Figure 5, a collar 63'is secured to shaft 48 withindoor casing 22. A spring 64- mounted between a bracket 65 on the wall 66of door casing22 and an arm 67 projecting from collar 63 biases shaft 48clockwise to engage the underside of locking lever 47 with arm 57 ofbell crank 58 and to seat the extension 52 of lever 47 in the recess 55in the cylindrical portion 54 of member 53.

A bell crank 70 is journalled upon a stud 71 carried by a bracket 72mounted on the exterior wall of the hatchway side door of casing 22. Arm73 of bell crank 70 projects into the interior of door casing. 22through an opening inthewall 66 thereof. A spring 76 I mounted between alug 77 onbracket 7 2 and the arm 73 of bell crank 70 maintains the end74 of arm? 3 positioned in the path of movement of lug 75. A stop 78 onbracket 7 2 limits the movement of arm 73 by spring 76.

When the end 74 of arm 73is positioned in the path of movement of lug75,as above described, counterclockwise movement of shaft 48 is prevented,thus preventing movement of locking lever 47 on the other end of shaft48 out-of recess55 and also preventing movement of arm 57 of bell crank58, thus locking latch bolt 27 against retraction from latchingposition. The other arm 80 of bell crank 70 carries a roller 81positioned in the hatchway to be engaged by aretiring cam 82 carried bythe elevator car 83.

As shown in Figure 1, the elevator car is supported on a car sling 84. Abracket 87 extending from the cross head of the car sling supports amotor 88. The windings-of motor 88 are connected in an operating circuitof the control system.'. Motor88 upon operation reels in a cable 91connected to retiring cam 82. Thus, when the operating circuit iscompleted and motor 88 is energized retiring cam 82 is withdrawn fromthe position in which :it engages the rollers 8lcarried by the arms ofbell cranks '7 0. The circuits are arranged so that motor 88 ismaintained energized until the arrival of the car '08 at a floor atwhich a stop is to be made. Motor 88 upon-'deenergizationpermitsretiring cam 82 to be projected by'gravity into position for operatingthe bell crank 70 at that floor.

Referring to Figures 3, 4, 5 and 9 in particular. a lever 92 extendingfrom collar 63, and offset from lug 75 for a purpose which willhereinafter become apparent, carries a support 93 of insulatingmaterial. A contact 94 mounted on support '93 is provided for bridging apair of contacts 95 and 96. Contacts 95 and96 are mounted in and projectrom casings 97, the casings being mounted on an insulating basesupported on the wall of door casing 22. Contacts 95 and 96 areconnected in a control circuit, such as a circuit for controllingv thestarting of the elevator car, and are adapted to be bridged by contact94 to permit completion of this circuit only when the hatchway door islocked in closed position.

Referring also to Figure 7, member 53 is also provided with a cam'98arranged to engage lever 47 to raise extension 52 from recess 55 inmember 53 as the door'is opened, in the event that extension has notbeen raised prior to opening of the door. As shown in Figure 4, the siderecess 55 slopes from the top of cylindrical portion 54 toward seat 56to provide a slight clearance between the side of the recess and theside of extension 52. The purpose of this clearance and the function ofcam 98 will be more fully dethe interlocking mechanism for that dooracts onarm 67 to'turn shaft 48 to seat the extension 52 of lever 47 inthe recess 55 in the cylindrical portion 54 of member '53. Spring 64also acts to maintain lever 47 in contact with-the arm57 of bell crank58 which is operatively connected tothe bolt which latches the door inclosedpositionQ Spring 64 also ried by shaft imaintainsxthe contact 94carried by lever 92 by preventing counterclockwise movement of shaft 48.Consequently, locking lever 47 car- 48 is held against movement by bellcrank 58. As bell crank 58 is connected tolatoh bolt 27 the knobs 44cannot be turned for withdrawing the bolt 27 to unlatch the door. Asshaft'48 is held against movement, contact 94 carried by arm 92 cannotbe moved from bridging engagement with contacts 95 and 96 to open thecontrol circuits. C

When the elevator car arrives at a landing at which a stop is to be madethe retiring cam motor 88 becomes deenergized. As a result, retiring cam82 moves by gravity downwardly and outwardly into the position in whichit engages the roller 81 carried by the arm of the bell crank of theinterlocking mechanism at that floor. Upon engagement of retiring cam 82with roller 81, as shown in Figures 1, 8 and 9, bell crank 70 is turnedagainst the force of spring 7 6. As bell crank 70 is operated by theretiring cam, the end 74 of arm 73 of the bell crank is movedupwardlyout of the path of movement of lug 75 on "collar 63 thus freeingshaft 48 for counter clockwise rotary movement. Latch bolt 27 thusunlocked to permit withdrawal of the bolt from keeper 34 to unlatch thedoor and to move extension 52 out of recess in the cylindrical portionof mem er 53. This po-- sition of arm 73 is illustrated in Figures 8 and9.

When a knob 44 of the door at that floor is turned, latch bolt 27 isWithdrawn against the force of spring 31 from the opening in keeper 34,thus unlatching the door. As bolt 27 is withdrawn bell crank-58 isturned about stud so that arm 57 acts to raise lever 47 and turn shaft48. As shaft48 is turned the lug 7 5 moves beneath arm 73 to theposition illustrated in Figures 8 and 9. Arm 92, being offset from lug75, is free to move without striking arm 73 of bell crank 70. As lockinglever 47 is raised byarm 57 of bell crank 58, the extension 52 of thelever'is raised out of recess 55 in the cylindrical portion 54 of member53 to the position in which the underside of the extension is parallelwith the top of the cylindrical portion 54, as shown in Figure 9.

As shaft 48 is turned,lever 92 moves therewith to move bridging contact94 out of engagement with contacts 95 and 96, thus opening the controlcircuit to prevent completion of a car starting circuit. In Figure 9 thedoor casing 22 has been broken away to illustrate this position of lever92 and contact 94., The

arrangement is such that the control circuit is opened before theunderside of extension 52 of locking lever 47 has been raised intoparallelism with the top of the-cylindrical portion 54 of member 53andbefore bolt 27 is retracted sufficiently to unlatch the door topermit opening movement thereof.

As the door has been unlatched, knob 44 may be employed as a grasp toopen the door. As the door is opened the cylindrical portion 54 ofmember 53 moves with the door about the centre line of hinges 24 movingrecess 55 from alinement with extension 52 of the locking lever. The topof cylindrical portion 54 moves beneath the extension 52 for supportinglocking lever 47 in its raised position while the door is open andthereby maintains contact 94 out of bridging relationship with contacts95 and 96 to prevent completion of a car starting circuit until the dooris returned to closed position and relatched.

The end of latch bolt 27 rides over the face of keeper 34 in the initialpart of the opening movement of the door to maintain bolt 27 retractedto keep arm 57 of bell crank 58 positioned to hold lever 47 in raisedposition until the door has been opened sufliciently to cause thecylindrical portion 54 to become firmly seated under the extension 52 ofthe locking lever. Thus, even in the event that turning movement is nolonger applied to a knob 44 to maintain bolt 27 retracted after the dooris unlatched, lever 47 is held in raised position by arm 57 of bellcrank 58 until the cylindrical portion of member 53 becomes effective tosupport lever 47 in raised position while the door is unlatched and inopen position. hen the end of bolt 27 rides off the face of keeper 34,spring 31 actsto move the bolt to projected position and arm 57 of bellcrank 58 moves from engagement with lever 47. However, lever 47 is nowsupported in raised position since the extension 52 of lever 47 rests onthe cylindrical portion 54 of member 53 as the latter turns about thecenter line of hinges 24 as the door is moved to open position. Sincelever 47 is supported in raised position shaft 48 can not be turnedcounterclockwise, Figure 9, and therefore contact 94 is held out ofbridging relation with contacts 95 and 96 to maintain the controlcircuit interrupted while the door is open.

In the event that latch bolt 27 on retraction is ineffective to raiselever 47, or in the event that the latch bolt is ineffective to latchthe door and retraction of the bolt is consequently unnecessary topermit movement of the door, the application of force to open the doorcauses movement of the cylindrical portion 54 of member 53 against theextension 52 of the l ver. This might result in damage to the parts.However, if, under the above conditions, the door ismoved toward openpositioncam 98 rides under and engages lever 47 raising the latter tomove extension 52 out of the recess in member 54. As the side of recess55 slopes from the top of member 54 toward the seat 56 a clearance isprovided for permitting movement of member 54 toward the side ofextension 52 as the extension is raised out of recess 55 by cam 98. Cam98 acts to support lever 47 in raised position until the cylindricalportion of member 53 is firmly seated under extension 52 for holding thelever in raised positionas previously de-' scribed. t will be apparentfrom the foregoing'description that cam 98 is effective to raise lever47 only when the elevator car is positioned at the floorat which thedoor is located and the end 74 of arm 73 is positioned out of the pathof movement of lug to permit movement of shaft 48 and locking lever 47.It will also be seen from consideration of Figure 9 that, when latchbolt 27 on retraction acts through hell crank arm 57 to raise lockinglever 47, cam 98 rides idly beneath the lever in the opening movement ofthe door.

When the door is released it is returned to closed position by theclosing and checking mechanism 25. As the door is-closed member 53 turnswith the door about thecenter line of hinges 24 to align recess 55 withthe extension of locking lever 47, which is supported in raised positionby the cylindrical portion of member 53. Arm 57 of bell crank 58- movesinto position beneath lever 47 but is held out of engagement with thelever by spring 31 which maintains bolt 27 in projected position. As thedoor nears closed position-the end of latch bolt 27 engages the face ofkeeper 34. The engagement of the end of latch bolt 27 with the face ofkeeper 34 causes the bolt to be retracted against the force of spring 31and movesthe arm 57 of hell crank 58 into engagement withlever 47 formaintaining lever 47 in raised position until the door is fully closed.lVhen the door reaches fully closed position recess 55 is alined withextension 52 of lever 47 and latch bolt 27 is projected by spring 31into the opening in keeper 34 to latch the door. As bolt 27 is projectedby spring 31,v the arm 57 of bell crank 58 moves downwardly permittingthe spring 64 to act on arm 67 to turn shaft 48 for maintaining lever 47in contact with the arm 57. Spring 64 alsoacts to seat the extension 52of locking lever 47 in recess 55. As shaft 48 is turned lever 92 movestherewith to cause contact 94' to bridge contacts 95 and 96 to ena lecompletionof the starting circuit of the elevator car.

When the circuit for cam motor 88 is completed, this motor reels incable 91, lifting the retiring cam 82 inwardly and upwardly out ofengagement with roller 81 carried by arm of bell crank 70. Spring76 thenacts on arm 73 to project roller 81 into position to be engaged byretiring cam 82 in a subsequent operation and to position the end 74 ofarm 73 in the path of movement of lug 75 for preventing movement ofshaft 48. As movement of shaft 48 is thus prevented lever 47 is lockedin engagement with arm 57 of bell crank 58 preventing withdrawal of bolt27 to unlatch the door.

It is to be noted that, in the absence of the car, the hatchway door ata landing cannot be unlatched inasmuch as the alignment of arm 73 withlug 75 prevents movement of locking lever 47 from cooperative relationwith bell crank arm 57 which is-connected to the latch bolt.

It is also to be noted that the operation of bell crank 70 of one of theinterlocking mechanisms by retiring cam 82, upon the arrival of the carat a floor at which a stop is to-be made, does not effect unlatching ofthe hatchway door but only removes the arm 73 from alinement with lug 75to unlock the latch and permit unlatching of the door. The door remainslatched in closed position until by a further operation the latch boltis retracted.

When the door is unlatched contact 94 is moved out of bridging relationwith contacts 95 and 96 before the door is fully unlatched and ismaintained out of engaging relation so long as the door is unlatohed oropen. Thus, the control circuits for the elevator car are maintainedopen to prevent operation of the car when a hatchway door is unlatchedor open.

Furthermore, when the door has been opened and reclosed it becomesautomatically latched in closed position and the control circuit for thecar is automatically prepared by bridging of contacts 95 and 96 bycontact 94 although the retiring cam remains in projected position untilan operating control is operated to start the car. Since contacts 95 and96 together with contact 94 and arm 92 of the interlocking mechanismassociated with each hatchway door are mounted wholly within the doorcasings the switch mechanisms are inaccessible and cannot be tamperedwith even when the door is open. I

Although the interlocking mechanism has been described as applied to thehinged type of door it is also applicable to sliding doors. In case ofsliding doors the lock member 53 may, for example, take the form of abar extending across the door and provided with a slot or recess forreceiving. the locking lever to lock the door.

-As many changes could be made in the above construction and manyapparently widely difierent embodiments of this inven-- tion could bemade without departing from the scope thereof, it is intended that allmatter contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in a limitingsense.

What is claimed is:

1. Locking mechanism for a hinged hatchway door comprising; a rotaryshaft mounted on the door casing at the hinged side of the door;latching means mounted at the other side of the door; means carried bythe door for operating said latching means; a lever carried by saidshaft; a member connected to said latching means and operable thereby tomove said lever and thus effect rotary movement of said shaft uponoperation ofsaid latching means by said operating means to unlatch saiddoor; means for preventing such rotary movement of said shaft, therebylocking said latching means in latching position; and means forreleasing said preventing means.

2. Locking mechanism for a hinged hatchway door comprising; a rotaryshaft mounted on the door casing at the hinged side of the door;latching means mounted at the other side of the door; means carried bythe door for operating said latching means; a lever carried by saidshaft; a member connected to said latching means and operable thereby tomove said lever and thus effect rotary movement of said shaft uponoperation of said latching means by said operating means to unlatch saiddoor; means for preventing such rotary movement of said shaft, therebylocking said latching means in latching position; means for releasingsaid preventing means to enable the operation of said latching means bysaid operating means; and a member carried by said door and movabletherewith as said door is opened for maintaining said lever in theposition into which it is moved by the member connected to said latchingmeans.

In an elevator installation; a door casing; a door hinged to saidcasing, said door being provided with an opening at the h nged sidethereof; a rotary shaft mounted on said door casing at the hinged sideof said door, said shaft extending into the door casing; latching meansmounted at the other side of said door; means carried by said door foroperating said latching means; a lever fixed to said shaft and extendingthrough said open ing into the interior of said door; a bell crankpivotally mounted Within said door, one arm of said bell crank beingpositioned beneath said lever; a link connecting the other arm of saidbell crank to said latching means, said link being wholly Within saiddoor; means carried by said door for operating said latching means tounlatch said door and for acting through said link and said bell crankto move said lever and thus efi'ect rotary movement of said shaft; acollar fixed to said shaft within said door casing; a lug on saidcollar; a bell crank mounted on saiddoor casing, one arm of said bellcrank extending into the interior of said door casing and being biasedinto the path of movement of said lug for preventing such rotarymovement of said shaft, thereby locking said latching means in latchingposition; and means for operating said second mentioned bell crank tomove said arm thereof out of the path of movement of said lug, therebyunlocking said latching means.

l. Interlocking mechanism for a hatchway door; means at one side of thedoor for latching the door in closed position; means for locking saidlatching means in latching position; means for unlocking said latchingmeans; manual 'means for operating said latching means, when unlocked,to unlatch said door; circuit controlling means; means operable by saidlatch operating means, during the unlatching of said door, for operatingsaid circuit controlling means; and means at the side of the dooropposite said latching means for preventing said circuit controllingmeans from returning to its initial, unoperated condition when the dooris open and the latch operating means is released.

5. In an elevator installation; an elevator car; a hinged hatchway door;means at the side of the door opposite the door hinges for latching saiddoor in closed position; means for locking said latching means inlatching position; means controlled by said car for unlocking saidlatching means; means for operating said latching means, when unlocked,to unlatch said door; circuit controlling means; and means operable bysaid latch operating means, when said door is unlatched, for operatingsaid circuit controlling means.

6. In an elevator installation; an elevator car; a hinged hatchway door;means at the side of the door opposite the door hinges for latching saiddoor in closed position; means for locking said latching means inlatching position; means controlled by said car for unlocking saidlatching means; means for operating said latching means, when unlocked,to unlatch said door; circuit controlling means; means operable by saidlatch operating means, when said door is unlatched, for operating saidcircuit controlling means; means for opening said door, when unlatched;and means carried by said door at i the hinged side thereof and movabletherewith for maintaining said circuit controlling means operatedwhen'said door is opened.

7 Interlocking mechanism for a hinged hatchway door comprising; means atthe side of the door opposite the hinges for latching the door in closedposition; means for locking said latching means in latching position;means for unlocking said latching means; means for operating saidlatching means, when unlocked, to unlatch said door; circuit controllingmeans mounted at the hinged side of the door; and means operable by saidlatch operating means, upon unlatching of said door, for operating saidcircuit controlling means.

8. Interlocking mechanism for a hinged hatchway door comprising; meansat the side of the door opposite the hinges for latching the door inclosed position; means for looking said latching means in latchingposition; means for unlocking said latching means; means for operatingsaid latching means, when unlocked, to unlatch said door; circuit,controlling means mounted at the'hinged side of the door; means operableby said latch operating means, upon unlatching of said door, foroperating said circuit controlling means; means for opening said door,when unlatched; and means mounted at the hinged side of said door andmovable therewith to maintain said circuit controlling meansoperatedwhen said door is opened.

9. In an elevator installation; a door casing; a door hinged to saidcasing; circuit controlling means within said door casing; a rotaryshaft mounted on and extending into said door casing; meanswithin saiddoor casing for connecting said circuit controlling means to said rotaryshaft for operation thereby; a lever fixed to said shaft; a membermounted on said door at the hinged side thereof, said member having aportion provided with a recess for receiving said lever; and meansoperable to move said lever out of said recess and to thereby turn saidrotary shaft to operate said circuit controlling means. i

10. In an elevator installation; a door casing; a door hinged tosaidcasing; circuit controlling means within said door casing; a rotaryshaft mounted on and extending into said door casing; means within saiddoor casing for connecting said circuit controlling means to said rotaryshaft for operation thereby; a lever fixed to, said shaft; a membermounted on said door at the hinged side thereof, said member having aportion provided with a recess for receiving said lever; means operableto move said lever out of said recess and to thereby turn said rotaryshaft to operate said circuit controlling means; and means for openingsaid door, said portion of said member cooperating with said lever whensaid door is opened to maintain said circuit controlling means operated.

11. In an elevator installation; an elevator car; a landing served bysaid,car;a door casing at said landing; a hatchway door hinged to saidcasing; a switch mounted in said door casing; a rotary shaft mounted onand extending into said door casing; means within said door casing forconnecting said switch to said shaft for operation thereby; a leverfixed to said shaft; a member mounted on said door at the hinged sidethereof, said member having a portion provided with arecess forreceiving said lever; means mounted at the other side of said door forlatching said door in closed position; a bell crank pivotally mountedwithin said door, one arm of.

said bell crank being adapted to move said.

lever out of said recess for effecting rotary movement of said shaft,the other arm of said bell crank being connected to said latching means;a collar fixed to said shaft within saiddoor casing; a lug onsaid'collar; an, arm biased into alinement with said lug for pre ventingsuch rotary movement of said shaft and thereby preventing. operation ofsaid switchand acting through said lever and said bell crank to. locksaid latching means in latching position; means, operable upon thearrival of said car-to stop at said landing, for moving; said arm out ofalinement with said lug to free said shaft for such rotary movement andthereby unlock said latching means means for operating said latchingmeans,

when unlocked, to unlatch said, door; said latching means, uponoperation, acting through said'hell crank to raise said lever out ofsaid recess and thereby effecting rotary movement of said shaft tooperate said switch and means for opening said door, said port-ionofsaid member cooperating with saidlever, when said door is opened, tomaintain said switch operated.

12. In an elevator installation; a hatchway; an elevator car therein; alanding served by said car; a door casing at said. landing; a hatchwaydoor hinged to said,

casing; means for latching said door in closed position; a membercarried by said door'at the-hinged side thereof, said member having aportion which projects from the landing side of said door and which isprovided with. a recess; a rotary shaft mounted in.- said. door casing;a lockinglever fixed to said shaft, saidlocking lever having anextension projecting through said door for co-- operation. with. saidportion of said member; means operatively connecting said latching meansand said locking lever; a switch mounted in said door casing forcontrolling the operation of said car; operating means for said switchcarried by said shaft; meansfor. causing rotary movement of said shaft.

to move said switch operating means to close said switch for permittingoperation of said car and to seat the extension of said locking lever inthe recess in said portion of said member when said door is in closedposition, said locking lever when so positioned also acting through saidconnecting means to lock: said latching means against operation tounlatch said door; a collar secured to said shaft; a lug on said collara bell crank pivotally mounted on the hatchway side of said door casing,one arm of said bell crank being adapted to be alined with said lug forpreventing rotary movement of said shaft to crank to aline said onearnrwith said lug a-ndto project said roller carrying arm into saidhatchway; a retiring cam carried by said car for engaging said roller tooperate said bell crank upon arrival of said car at said landing, saidbell crank, upon operation by said retiring cam, turning about itspivotal mounting to move said one arm out of alinement with said lug forpermitting operation of said latching means to unlatch said door androtary movement of said shaft to open said switch; means for unlatchingsaid door, said means upon operation acting through said connectingmeans and said locking lever to move the extension of said locking leverout of recess in the cylindrical portion of said member and to therebyturn said rotary shaft to move said switch operating means to open saidswitch for preventing operation of said car, when said door isundatched; and means for opening said door,

the cylindrical portion of said member moving with said door about thecenter line of the hinges thereof, upon opening of said door, to movethe recess therein out of alinement with the extension of said lockinglever and to engage said locking lever to maintain it inraised positionto prevent closing 01 said switch while said door is open.

7 13. In an elevator installation; an elevator car; a hinged hatchwaydoor; means at the side of the door opposite the door hinges forlatching said door in closed position;'means for locking said latchingmeans in latching position; means controlled by said car for unlockingsaid latching means; means for operating said latching means, whenunlocked, tounlatch said door; circuit controlling means means operable,prior to the un-' latching of said door, for operating saidcircuitcontrolling means; and means carried by said door at the hinged sidethereof and movable therewith for maintaining said circuit controllingmeans operated when said door is opened,

14. Interlocking mechanism for a hinged hatchway door comprising; meansat the side of the door opposite the hinges for latching the door inclosed position; means for locking said latching means in latchingposition; means for unlocking said latching means; means for operatingsaid latching means, when unlocked,to unlatch said door; circuitcontrolling means mounted at the hinged side of the door; means operableprior to the opening of said door, for operating said circuitcontrolling means; and means mounted at the hinged side of said door andmovable therewith to maintain said circuit controlling means operatedwhile said door is open.

15. In an elevator installation; a door casing,a hatchway door hinge-dto said casing,

means at the side of the door opposite the door hinges for latching saiddoor in closed osition' means for lockin said latchin I b o means inlatching position; means for unlocking said latching means, saidunlocking means including alever pivotally supported upon the doorcasing at the side upon which the door is hinged and having an armextending into the shaftway, and also including a retractable cam on theelevator car which engages said lever arm when the elevator car stopsopposite said hatchway door; circuit closing means mounted on said doorcasing at the side upon which the door is hinged; and means, alsomounted on said door casing at the side upon which the door is hinged,and dependent upon the operation of said lever, for controlling theoperation of said circuit closing means. i

16. In an elevator installation; a door casing; a hatchway door hingedto said casing; means at the side of the door opposite the door hingesfor latching said door in closed position; door mechanism, mounted uponsaid door and having an element thereof adjacent the hinged side of saiddoor, connected to said latching means so that the operation of saidlatching means to unlatch the door causes movement of said element;means for locking said latching means in latching position, said lockingmeans being mounted on the side of the door casing upon which said dooris hinged, and being effective to cooperate with said movable element ofsaid door mechanism to prevent said movement of said element whichaccompanies the unlatching of the door, thereby locking said latchingmeans in latching position; means including a car cam for unlocking saidlatching means; interlock contact mechanism for the elevator operatingcircuits mounted in said door casing on the side thereof upon which saiddoor is hinged; means for operating said interlock contact mechanism toopen-circuiting position prior to the opening of said hatchway door; andmeans at the hinged side of said door for preventing said interlockcontact mechanism from returning to its initial, closed circuit positionwhile said hatchway door is open.

17. In an elevator installation ;'a door casing; a hatchway door hingedto said casing; means at the side of the door opposite the door hingesfor latching said door in closed position; door mechanism, mounted insaid door and having an element thereof adjacent the hinged side or"said door, connected to said latching means so that the operation ofsaid latching means to unlatch the door causes movement of said element;means for locking said latching means in latching position, said lockingmeans being mounted on the side of the door casing upon which said dooris hinged, and being effective to cooperate with said movable element ofsaid door mechanism to prevent said movement or said element whichaccompanies the unlatching of the door, th reby locking said latchingmeans in latching position; means for unlocking said latching means,said unlocking means including a lever pivotally supported upon the doorcasing at the side upon which the door is hinged, and having an armextending into the shaftway, and said unlocking means, when operated,rendering said lockingmeans ineffective; a retractable cam carried bythe elevator car which, upon the stopping of the car opposite saidhatchway door, engages with said lever arm, thereby to operate saidunlocking means; interlock contact mechanism for the elevator operatingcircuits mounted in said door casing on the side thereof upon which saiddoor is hinged, and arranged to be accessible only from the hatchwaymeans for operating said interlock contact mechanism to open-circuitingposition after said elevator car has stopped opposite said hatchway doorr and prior to the opening thereof; and means for maintaining saidinterlock contact mecha,

nism in open-circuiting position while said hatchway door 1s open, saidmaintaining means including a cam carried by said door 7 adjacent thehinged side thereof, and an arm,

connected to said means for operating the interlock contact mechanism,engaging said cam while said door is open, a

In testimony whereof, I name to this specification.

EDWARD LEE DUNN.

have signed my

